CVE-2026-53769 Details
Description
Avo is a framework to create admin panels for Ruby on Rails apps. From version 2.28.0 to before version 3.32.0, Avo's direct attachment upload endpoint lacks server-side upload authorization and bypasses the documented field-level upload policy methods such as upload_{FIELD_ID}?. An authenticated Avo user who can reach the Avo attachment upload endpoint can replace or add attachment content, including binary content, filename, and content-type metadata, on a resolved record even when both update? and upload_<field>? policies deny the operation. This primarily affects multi-role Avo Pro/Advanced-style deployments where non-administrator or restricted operator users can reach Avo and per-record or per-field operations are expected to be enforced by policies. This issue has been patched in version 3.32.0.
A vulnerability exists in Avo, a framework for creating admin panels in Ruby on Rails applications, specifically in versions 2.28.0 prior to 3.32.0. The issue arises in the direct attachment upload endpoint, which lacks proper server-side authorization and bypasses the established field-level upload policies. This vulnerability allows an authenticated user to manipulate attachment content on a record, including binary data, filenames, and content-type metadata, even when such actions are explicitly denied by the application's policies. The problem is most pronounced in Avo Pro or Advanced deployments, where non-administrator users can access the upload endpoint and where per-record or per-field policy enforcement is expected.
Users can update to Avo version 3.32.0 or later, where this vulnerability has been patched.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 4, 2026CISA-ADP
Assessed Sep 9, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/avo-hq/avo/security/advisories/GHSA-pqpw-cvm4-8mv9 | CISA-ADP | AdvisoryExploitRemedyVendor |
| https://github.com/avo-hq/avo/commit/de12070dbac0cb6a7e2bea357f9697f99e92554c | [email protected] | Source CodeVendor |
| https://github.com/avo-hq/avo/pull/4520 | [email protected] | Source CodeVendor |
| https://github.com/avo-hq/avo/releases/tag/v3.32.0 | [email protected] | Release NotesVendor |
| https://github.com/avo-hq/avo/security/advisories/GHSA-pqpw-cvm4-8mv9 | [email protected] | AdvisoryExploitRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-862 | Missing Authorization | [email protected] |
| CWE-863 | Incorrect Authorization | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Avo | >= 2.28.0, < 3.32.0 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 9, 2026 | CVE Modified | CISA-ADP |
| Sep 4, 2026 | New CVE Received | [email protected] |